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Old 11-09-2019, 06:29 PM   #1
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Transmission maintenance curiosity

Hello all!

I was considering having routine maintenance done of my transmission, nothing wrong with it but about 4000 hours on it. It has only had oil changes, and in some reference material I once saw it called for a rebuild at some interval. Out of curiosity I inquired at a local service shop, they quoted me over $4000 in parts alone for the service, a new replacement transmission was $1500...

What do any of you do to service your transmission? I run a Yanmar 4jh, Kanzaki transmission...

Thanks for input :-)
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Old 11-09-2019, 07:23 PM   #2
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Doug, beyond routine maintenance as per the manufacturer, if it ain't broke...........
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Old 11-09-2019, 07:24 PM   #3
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I ran a Yanmar with Kanzaki for years. Mechanical gear. Just keep changing the oil. If things start to wear you will experience delayed engagement. I had mine rebuilt when that started to happen. Was about $1500 plus the damper plate. Plate was $900. Ouch!,
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Old 11-09-2019, 07:25 PM   #4
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I changed oil every 100 hours or yearly. Straight 30 weight.
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Old 11-09-2019, 07:39 PM   #5
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Different transmission but same idea.
I have a ZF 280.1. Holds about a gallon of straight 30 weight oil. Change it every 500 hours or once a year. Nothing ever failed because the oil got changed too many times. Have the oil analyzed by Blackstone. I'm looking for wear metals and salt. If you have a transmission cooler going bad, you may get elevated sodium levels (this happened to me, caught it early). If you're transmission cooler doesn't have an anode (pencil zinc), you might think about replacing it before it fails. Other than that, just keep using it until it starts having problems.

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Old 11-09-2019, 07:49 PM   #6
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Routine oil and filter change maintenance and an oil analysis at every change.
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Old 11-09-2019, 08:44 PM   #7
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I change the oil every year or 250 hours. I am getting ready to change the damper plate in one since I have the engine out. And I am going to replace the oil coolers since I donít know how old they are.
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Old 11-24-2019, 10:31 AM   #8
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If a Velvet Drive, I have rebuilt a couple of them both for myself, son, friends. A kit with all seals, gaskets, springs, plates is available for under $200 you will seldom need any hard parts. You may go through 2-3 damper plates b/4 needing to look into your velvet drive.
I had 2 incidents which demonstrate how strong these transmissions are. One time while under full power, someone on the bridge knocked the shift into neutral with a knee, b/4 I could act she slammed it back into gear seconds later. No damage. Another time made a 40 mile trip in from fishing grounds and found transmission wouldn't go into reverse. After finally picking up mooring found there was nothing but salt water in the transmission due to cooler failure. Also no damage after changing oil several times.
I think your time would be better spent keeping an eye on your damper plate and making sure you have a new copper/nickel cooler in place and the old one aboard as a spare.
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Old 11-24-2019, 12:23 PM   #9
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Quote:
Originally Posted by Ken E. View Post
Doug, beyond routine maintenance as per the manufacturer, if it ain't broke...........
dittto. Keep the oil full, don't slam it into gear, don't run WOT in reverse, could last another 4000.
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Old 11-24-2019, 05:32 PM   #10
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Much appreciate the responses, it was a curiosity question rather than "need". I can see where replacing the raw water cooling might be wise before it has a chance to fail. It is (so far) functioning as designed with no quirks!
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